Semisolid injection molding machine with multi-station injection

Abstract

The invention relates to a semisolid injection molding machine with multi-station injection. The semisolid injection molding machine with multi-station injection comprises an injection mold and semisolid injection mechanisms. An injection mold cavity and injection sprues communicating mutually are arranged on the injection mold; two or more than two sets of semisolid injection mechanisms are arranged; two or more than two injection sprues are arranged corresponding to the semisolid injection mechanisms; the injection sprues communicate with the injection mold cavity through different injectionrunners; and the semisolid injection mechanisms communicate with the corresponding injection sprues. According to the semisolid injection molding machine with multi-station injection provided by theinvention, semisolid magnesium alloy is injected through the two sets of semisolid injection mechanisms, so that the injection volume is effectively increased, and the flow length ratio is reduced; and the structure is suitable for the occasions requiring producing thin-wall or thick-wall magnesium alloy products with high production quality and large flow length ratio.

Description

technical field [0001] The invention relates to a semi-solid injection molding machine, in particular to a semi-solid injection molding machine for multi-station injection of magnesium alloy or aluminum alloy. Background technique [0002] The traditional semi-solid injection molding machine has the following shortcomings in the production of products: [0003] First, the injection volume is not large. Half of the traditional semi-solid injection molding machine is only equipped with a set of injection unit, and the injection unit adopts the structure of barrel and screw. Metal particles are melted by heating the barrel and stirring and shearing the screw. The molten material is delivered to the storage cavity through the push of the screw, and finally injected into the mold cavity through the injection action of the screw; generally, the injection volume of such a mechanism is less than that of the die-casting method, because the die-casting method pre-melts the material th...

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Problems solved by technology

[0003] First, the injection volume is not large. Half of the traditional semi-solid injection molding machine is only equipped with a set of injection unit, and the injection unit adopts the structure of barrel and screw. Metal particles are melted by heating the barrel and stirring and shearing the screw. The molten material is delivered to the storage cavity through the push of the screw, and finally injected into the mold cavity through the injection action of the screw; generally, the injection volume of such a mechanism is less than that of the die-casting method, because the die-casting method pre-melts the material through the furnace, and then Pour into the injection chamber and inject into the mold cavity. The melting process and the injection process are carried out separately and are independent of each other. The injection volume is only related to the diameter of the injection head. Therefore, the pressure can be increased by increasing the diameter of the injection head. Injection volume; relatively speaking, the semi-solid injection molding process is an organic combination of the melting process and the injection process, which are mutually restricted. Increasing the injection volume by increasing the overall diameter and length of the barrel screw will inevitably affect the effect of the melting material. At the same time, it will also cause adverse conditions such as slow melting process and insufficient injection pressure; moreover, the barrel and screw of the semi-solid injection molding machine are consumables and must be replaced after a period of use. The material used for manufacturing is special steel. The cost is very high, so it is not economical to increase the injection volume by increasing the barrel screw; the shortcoming of the semi-solid injection molding machine's insufficient injection volume determines that it is difficult to produce large thick-walled products, and it is produced with a 650-ton machine Taking magnesium alloy as an example, the die-casting method can form a product of 3.3-5.5kg, but the semi-solid injection molding can only form a product of up to 1kg;

[0004] Second, the flow length ratio is not large. The flow length ratio refers to the ratio between the total length of the molten material flowing in the mold cavity and the average wall thickness of the product. The semi-solid magnesium alloy molten material is injected into the mold cavity It will solidify rapidly in a very short time, especially when injecting semi-solid melt into the cavity of thin-walled products, which requires the screw to provide high injection pressure (above 10MPa) and extremely fast injection speed (3m / s or so) to ensure that the molten material fills the entire cavity, but if the process of the molten material in the mold is too long, even under the high-pressure and high-speed injection process, the molten material will not have time to fill the entire cavity and will pass in the middle. Cold solidification leads to under-injection, further increasing the injection pressure and injection speed will inevitably have a negative impact on the stability and life of the machine, so the existing semi-solid injection process is difficult to process a very long process (very large flow length ratio) ) thin-walled products

[0005] It is the above two shortcomings that greatly restrict the promotion and application of traditional semi-solid injection molding technology

[0006] In addition, the above-mentioned traditional semi-solid injection molding machine can only produce single-component products, but with the improvement of living standards, single-component products have been difficult to meet the needs of people's diversified life

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